Frame
A frame is a bounded unit of context or knowledge. It may hold a claim, observation, question, decision, or a larger composition of such material. Frames can refer to one another and can be read at different levels of detail.
Our current apparatus uses typed frames with named relationships. That gives interaction events something more informative to touch than undifferentiated text: we can distinguish an encounter with evidence from an encounter with an objection, for example, and observe how those structures are used over time.
This is one useful implementation of a substrate, not a requirement for observing substrate dynamics. A different system might use documents, chunks, memories, tool states, or another unit altogether. The general method needs only a shared medium, observable interactions, and enough structure to compare how activity changes over time.
The distinction matters because our public claim concerns the dynamics of the medium, not the details of one graph-construction pipeline.